Guidelines and Design Specifications For Crash Barriers ... - uttipec
Guidelines and Design Specifications For Crash Barriers ... - uttipec
Guidelines and Design Specifications For Crash Barriers ... - uttipec
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
DELHI DEVELOPMENT AUTHORITY<br />
UNIFIED TRAFFIC AND TRANSPORTATION INFRASTRUCTURE (PLG & ENGG) CENTRE<br />
( U T T I P E C )<br />
<strong>Guidelines</strong> <strong>and</strong> <strong>Design</strong> <strong>Specifications</strong><br />
<strong>For</strong><br />
<strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
2 nd Floor, VIKAS MINAR, NEW DELHI. Telefax: 23379042<br />
Email: <strong>uttipec</strong>wg.ia@gmail.com
UTTIPEC<br />
CONTENTS<br />
1. Introduction 4<br />
2. Guiding Principles 4<br />
3. <strong>Crash</strong> Barrier 4<br />
4. Pedestrian Railings/ Guard-rails 10<br />
5. Dividers 16<br />
6. Concluding Recommendations 20<br />
Members of Working Group I-B 21<br />
Members of the Sub-Group 21<br />
Acknowledgements 21<br />
References 22<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
2
UTTIPEC<br />
LIST OF FIGURES<br />
Fig 1: Barrier Placement 6<br />
Fig 2: Typical Detail of thrie beam section 6<br />
Fig 3: Barrier cast-in-situ design 7<br />
Fig 4: Barrier cast-in-situ design 8<br />
Fig 5: A typical layout of four arm channelised intersection with zebra crossing <strong>and</strong> railing barrier.<br />
11<br />
Fig 6: Typical RCC pedestrian ‘Guardrail’ 12<br />
Fig 7: Typical RCC pedestrian ‘Guardrail’ 13<br />
Fig 8: Steel Guardrails 13<br />
Fig 9: Concrete Screening 13<br />
Fig 10: Steel <strong>Barriers</strong>, Railing & Fencing 14<br />
Fig 11: Steel <strong>Barriers</strong>, Railing & Fencing 14<br />
Fig 12: Existing MS Railing at Lodhi Road 15<br />
Fig 13: Existing MS Railing at Aurobindo Marg 15<br />
Fig 14: Parabolic Divider 16<br />
Fig 15: Barrier cast-in-situ design 17<br />
Fig 16: Kerb Stone with railing in between 17<br />
Fig 17: Type design for reflective traffic cone 18<br />
Fig 18: High density traffic 18<br />
Fig 19: Water filled Jerry can 18<br />
Fig 20: Typical design of a movable central divider 19<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
3
UTTIPEC<br />
1. Introduction<br />
With an exponential growth of vehicular traffic, the pedestrians in the city are often exposed<br />
to accidents <strong>and</strong> are marginalized in the mobility network. The pedestrians are invariably<br />
channelised on the narrow footpaths which sometimes are encroached. They are expected to use<br />
the pedestrian underpasses or foot-over bridges to cross the high volume traffic roads. With the<br />
increasing flyovers <strong>and</strong> speeds, the frequency of accidents involving the pedestrians has<br />
increased.<br />
With the objective to ensure the entitlements of the pedestrians in terms of mobility, safety<br />
<strong>and</strong> convenience, slow <strong>and</strong> fast vehicular traffic crash barriers, dividers <strong>and</strong> pedestrian’s railings<br />
on the central verge are provided, together with Foot Over Bridges (FOB), sub-ways etc. Many<br />
times the FOB’s <strong>and</strong> sub-ways are underused as they cause inconvenience <strong>and</strong> insecurity to the<br />
users. As a result, the pedestrians are seen jaywalking <strong>and</strong> climbing over the barriers <strong>and</strong> railings<br />
in order to cross the high intensity, high speed roads <strong>and</strong> flyovers. As such, it is necessary to<br />
provide wide <strong>and</strong> safer pedestrian corridors. In the areas/ roads with high pedestrian traffic, it may<br />
be necessary to provide pedestrian corridors at grade while the motorised vehicles move up <strong>and</strong><br />
down.<br />
This may be possible by raising the carriageway of the road by about 2.4 meters, so that<br />
pedestrians keep moving freely at the ground level for crossing the roads. Such facility should be<br />
provided in front of the Railway Stations, Metro Stations, ISBT, Exhibition Ground, large<br />
commercial center <strong>and</strong> office complexes (such as ITO, RK Puram, Central Secretariat, etc.)<br />
2. Guiding Principles<br />
2.1 To ensure <strong>and</strong> safeguard pedestrian Right of Way, safety <strong>and</strong> accessibility, including<br />
wheelchairs.<br />
2.2 To ensure vehicle <strong>and</strong> driver’s safety<br />
2.3 To promote segregated traffic movement for various types of traffic <strong>and</strong> categories of vehicles<br />
2.4 To offer the flexibility for adjustment of central verge/ barrier/ railing according to directional<br />
volume of traffic.<br />
2.5 To synchronise design with the road users/ pedestrians behavior <strong>and</strong> needs<br />
2.6 To evolve design with sensitivity to the aspects of aesthetics, sight lines, streetscape, lighting<br />
<strong>and</strong> heritage.<br />
2.7 To consider the cost/ economy factors<br />
2.8 Ease of maintenance<br />
3. <strong>Crash</strong> Barrier<br />
3.1 Definition<br />
<strong>Crash</strong> barriers are designed to withst<strong>and</strong> the impact of vehicles of certain weights at certain<br />
angle while traveling at the specified speed. They are expected to guide the vehicle back on the<br />
road while keeping the level of damage to vehicle as well as to the barriers within acceptable<br />
limits.<br />
Ideally a crash barrier should present a continuous smooth face to an impacting vehicle, so<br />
that the vehicle is redirected, without overturning, to a course that is nearly parallel to the barrier<br />
face <strong>and</strong> with a lateral deceleration, which is tolerable to the motorist. To achieve these aims the<br />
vehicle must be redirected without rotation about both its horizontal or vertical axis (that is,<br />
without ‘spinning out’ or overturning), <strong>and</strong> the rate of lateral deceleration must be such as to<br />
cause the minimum risk of injury to he passengers.<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
4
UTTIPEC<br />
3.2 Objectives<br />
i. Reducing the likelihood of a vehicle crossing the central reserve <strong>and</strong> reaching the opposite<br />
carriageway.<br />
ii. Minimising the damage to a barrier <strong>and</strong> vehicle, following vehicle strike <strong>and</strong> also reducing the<br />
risk to the workforce <strong>and</strong> work related congestion.<br />
iii. Being maintenance-free <strong>and</strong> having a life of 25 to 50 years.<br />
3.3 Types of <strong>Crash</strong> <strong>Barriers</strong><br />
In view of the above factors, various options should be considered in evolving the need,<br />
location <strong>and</strong> design of the crash barriers, central railings <strong>and</strong> dividers.<br />
i. No provision, vehicular carriageway raised for pedestrian walkway at grade.<br />
ii. 15 cm to 25 cm high curb stone.<br />
iii. Flexible/ removable/ sinking divider or railing.<br />
iv. Water filled plastic jerry can safety barrier.<br />
v. Reinforced Glass/ Plastic/ Rubber railing.<br />
vi. Jersey <strong>Barriers</strong> (concrete) <strong>and</strong> its variations (constant slope, F shape, Jali, etc).<br />
vii. Steel concrete barriers, Railings, Fencing etc.<br />
viii. Hybrid combining two or more options<br />
According to IRC, following are the categories of crash barriers:<br />
Category Application Containment for<br />
P-1: Normal Containment Bridges carrying expressway, 15 kN vehicle at 110 km/h,<br />
or equivalent<br />
<strong>and</strong> 20 degree angle of impact<br />
P-2: Low Containment All other bridges except bridge 15 kN vehicle at 80 km/h, <strong>and</strong><br />
over railways<br />
20 degree angle of impact<br />
P-3: High Containment At hazardous <strong>and</strong> high risk 30 kN vehicle at 60 km/h, <strong>and</strong><br />
locations, over busy railway<br />
lines, complex interchanges,<br />
etc.<br />
20 degree angle of impact<br />
According to the IRC (6-2000) the crash barriers shall be provided at the following locations:<br />
i. <strong>For</strong> bridges without foot paths, concrete crash barriers shall be provided at the edge of<br />
the carriageway.<br />
ii. The type design for the crash barriers may be adopted as per IRC:5. The design<br />
loading for the barriers shall be as per Clause 209.7 of IRC:6.<br />
iii. <strong>For</strong> bridges with foot paths, pedestrian railing shall be provided on the outer side of<br />
footpath.<br />
iv. The railings of existing bridges shall be replaced by crash barriers, where specified in<br />
Schedule-B of the Concession Agreement.<br />
v. Parapets/ Railings of the existing bridges/ culverts to be repaired/ replaced shall be<br />
specified in Schedule-B of the Concession Agreement.<br />
In the urban environment traffic barriers are needed on urban motorways <strong>and</strong> primary<br />
distributors, where speeds are high <strong>and</strong> dangerous.<br />
Traffic barriers should be erected on both sides of roads on embankments 6m high or more<br />
<strong>and</strong> on the outer edge of the roads where the radius is 850m or less <strong>and</strong> the embankment height<br />
3m or more.<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
5
UTTIPEC<br />
<strong>Barriers</strong> may also be needed on an embankment where there is road, railway or river at the<br />
foot, on bridges with lightly built parapets or to protect bridge piers or other obstruction on the<br />
central reserve or verges.<br />
This is recommended on embankment, ramps to flyovers <strong>and</strong> interchanges <strong>and</strong> high speed<br />
corridors in open area. (Not recommended for highly built up area with pedestrian <strong>and</strong> cycle<br />
traffic). (Fig 1)<br />
End Treatment: It is important to provide suitable <strong>and</strong> treatment for such type of barrier in view<br />
of safety. The ends of this barrier must either be embedded into ground by tapering down or<br />
these must be embedded into the rigid parapet wall of a culvert or specially prepared rigid<br />
parapet fir the purpose of imbedding.<br />
Fig 1: Barrier Placement<br />
Source: IRC: SP: 73-2007<br />
Fig 2: Typical Detail of thrie beam section<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
Source: IRC: SP: 73-2007<br />
<strong>Crash</strong> barriers can be rigid type, using cast-in-situ precast reinforced concrete panels, or of<br />
flexible type constructed using metallic cold-rolled <strong>and</strong>/ or hot-rolled sections, the metallic type,<br />
called semi-rigid type, suffer large dynamic deflection of the order of 0.9 to 1.2m, or on impact,<br />
whereas, the 'rigid' concrete type suffer comparatively negligible deflection (Fig 3). The efficacy<br />
6
UTTIPEC<br />
of the two types of barriers is established on the basis of full size tests carried out by the<br />
laboratories specializing in such testing. Due to the complexities of the structural action the value<br />
of impact force cannot be quantified.<br />
Fig 3: Barrier cast-in-situ design<br />
Source: IRC: SP: 73-2007<br />
A certificate from such laboratory can be the only basis of acceptance of the semi-rigid type,<br />
in which case all the design details <strong>and</strong> construction details tested by the laboratory are to be<br />
followed in to without modifications, <strong>and</strong> without changing relative strengths <strong>and</strong> positions of any<br />
of the connections <strong>and</strong> elements.<br />
<strong>For</strong> rigid barrier, at the end compulsory left out <strong>and</strong> right out signage be placed as per IRC<br />
67:2001. The end of these rigid barriers may be treated with retro reflective tape or paint for night<br />
visibility <strong>and</strong> distant visibility.<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
7
UTTIPEC<br />
Fig 4: Barrier cast-in-situ design<br />
Source: IRC: SP: 73-2007<br />
3.4 <strong>Crash</strong> <strong>Barriers</strong> need to be provided at the following locations:<br />
<strong>Crash</strong>/ Safety barrier of rigid, flexible or semi rigid type, in accordance with MOSRT&H<br />
guidelines/ circular shall be provided at following locations:<br />
i. Where height of embankment is 3m or more,<br />
ii. Where height of embankment is retained by a retaining structure,<br />
iii. Between main carriageway <strong>and</strong> cycle track (if any) in bridges.<br />
iv. At hazardous location identified through safety audit or at the edge of the flyovers/ bridges.<br />
3.5 <strong>Design</strong> Requirements<br />
According to IRC 6-2000, the below table states the minimum requirement for design of the crash<br />
barriers:<br />
Item Requirement<br />
Parapet Type<br />
P1 In-situ/ P2 In-situ/ P3 In-situ<br />
Precast Precast<br />
1 Shape Shape on traffic side to be as per IRC:5, or New Jersey<br />
(NJ) Type of 'F' Shape designated thus by AASTHO<br />
2 Minimum grade of concrete M-40 M-40 M-40<br />
3 Minimum thickness of RCC<br />
wall (at top)<br />
175 mm 175 mm 250 mm<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
8
UTTIPEC<br />
4 Minimum moment of<br />
resistance at base of the wall<br />
[see note (i)] for bending in<br />
vertical plane with<br />
reinforcement adjacent to the<br />
traffic face [see note (ii)].<br />
5 Minimum moment of<br />
resistance for bending in<br />
horizontal plane with<br />
reinforcement adjacent to<br />
outer face [see note (ii)].<br />
6 Minimum moment of<br />
resistance of anchorage at<br />
the base of a pre-cast<br />
reinforced concrete panel.<br />
15 kNm/m 7.5 kNm/m 100 kNm/m for<br />
end section <strong>and</strong><br />
75 kNm/m for<br />
7.5 kNm/m 3.75 kNm/m<br />
intermediate<br />
section [see note<br />
(iii)]<br />
40 kNm/m<br />
22.5 kNm/m 11.25 kNm/m Not Applicable<br />
7 Minimum transverse shear<br />
resistance at vertical joints<br />
between precast panels or at<br />
vertical joints made between<br />
lengths or in-situ parapet.<br />
44 kNm/m 22.5 kNm/m Not Applicable<br />
8 Minimum height 900 mm 900 mm 1550 mm<br />
Source: IRC 6-2000<br />
Notes:<br />
i. The base of wall refers to horizontal sections of the parapet within 300 mm above the<br />
adjoining paved surface level. The minimum moments of resistance shall reduce linearly<br />
from the base of wall value to zero at top of the parapet.<br />
ii. In addition to the main reinforcement, in items 4 <strong>and</strong> 5 above, distribution steel equal to<br />
50 per cent of the main reinforcement shall be provided in the respective faces.<br />
iii. <strong>For</strong> design purpose the parapet Type P3 shall be divided into end sections extending a<br />
distance not greater than 3.0 m from ends of the parapet <strong>and</strong> intermediate sections<br />
extending along remainder of the parapet.<br />
iv. If concrete barrier is used as a median divider, the steel is required to be placed on the<br />
both sides.<br />
v. In case of P3, In-situ type, a minimum horizontal transverse shear resistance of 135<br />
kNm/m shall be provided.<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
9
UTTIPEC<br />
4. Pedestrian Railings/ Guard-rails<br />
4.1 Pedestrian Railing between Footpath <strong>and</strong> Carriageway/ Central Verge<br />
Where considerable pedestrian traffic is expected, railing in the median of the road <strong>and</strong><br />
reinforced concrete crash barrier is provided separating the vehicular <strong>and</strong> pedestrian traffic. <strong>For</strong><br />
rigid railing, the strength should be equivalent to that of rigid RCC type. <strong>For</strong> areas of low intensity<br />
of pedestrian traffic, semi-rigid type of railings, such as concrete, steel, etc. can be adopted.<br />
4.2 Objectives<br />
Pedestrian guard-rails in the vicinity of zebra crossing should be of sufficient length to deter<br />
pedestrians from crossing the road at any arbitrary point along the road. Night time visibility of<br />
zebra crossing is of vital importance <strong>and</strong> this can be achieved through proper lighting of the<br />
intersection area.<br />
4.3 Location<br />
Use of pedestrian guard-rails could be considered under the following situations:<br />
i. Hazardous locations on straight stretches<br />
In particularly busy reaches where the road is congested <strong>and</strong> vehicles move at a fast pace,<br />
guard-rails should be provided on both sides of the carriageway so as to segregate <strong>and</strong><br />
channelise the pedestrians to the planned walking <strong>and</strong> crossing facilities.<br />
ii. Schools<br />
Provision of guard-rails near schools where children would other-wise run straight into the<br />
road is essential. If there is a pedestrian crossing or a school crossing patrol nearby, the<br />
guard-rails must be extended up to sufficient length (150 M) in either side of road.<br />
iii. Bus Stations/stops, Metro Railway Stations, etc.<br />
Provision of guard-rails along side-walks with suitable pedestrian crossing facility at bus<br />
stops, railway stations <strong>and</strong> other areas of heavy pedestrian activity such as cinema houses,<br />
stadiums, etc. are recommended for guiding pedestrian’s movement <strong>and</strong> enhancing safety in<br />
such areas.<br />
iv. At Junctions/Intersections<br />
Railing barriers should be provided to prevent people from crossing the junctions diagonally<br />
at signalised/ unsignalised intersections. The barrier must open only at planned crossing<br />
facility (at the zebra crossing). It is recommended to put blinkers before the zebra crossing<br />
which should be made m<strong>and</strong>atory. At both signalised <strong>and</strong> unsignalised junctions the railing<br />
barrier should be provided for sufficient length to guide the pedestrians to the nearest<br />
planned pedestrian crossing. Pedestrian guard-rails in the vicinity of zebra should be of<br />
sufficient length to deter pedestrians from crossing the road at any arbitrary point along the<br />
road. (Fig 5)<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
10
UTTIPEC<br />
Fig 5: A typical layout of four arm channelised intersection with zebra crossing <strong>and</strong> railing barrier.<br />
Source: IRC: 103-1988<br />
As the guard-rails would confine the movement of pedestrians to the footpath, it is obligatory that<br />
sufficient width of footpath be made available for the use of pedestrians.<br />
v. Overpass Subway, etc.<br />
Guard-rails may be necessary at these locations in order to guide <strong>and</strong> compel the pedestrians to<br />
use the facilities provided for them.<br />
vi. Central verges/ Footpaths<br />
Where there is a central verge or a median with frequent pedestrian crossing to either side,<br />
guard-rails can be erected within it to deter the pedestrians from attempting a crossing.<br />
Where considerable pedestrian traffic is expected, railing between the footpath <strong>and</strong> carriageway<br />
<strong>and</strong> / or on the median of the road is provided separating the vehicular <strong>and</strong> pedestrian traffic.<br />
4.4 <strong>Design</strong> Requirements <strong>and</strong> Options<br />
As the guard-rails would confine the movement of pedestrians to the footpath, it is obligatory<br />
that sufficient width of footpath be made available for the use of pedestrians. Railing should not<br />
be placed in case the width of side walk is less than 1.2 M.<br />
The design of railings/ guard rails should be consistent for a particular corridor/ area. It should<br />
be as far as possible uniform <strong>and</strong> relate with the boundary walls, urban character <strong>and</strong> street<br />
furniture. The design of guard-rails should be neat, simple in appearance <strong>and</strong>, as far as possible,<br />
v<strong>and</strong>al proof. Two aspects which need special consideration are the height of h<strong>and</strong>-rail <strong>and</strong> the<br />
obstruction to visibility. The height should be sufficient so as to deter people from climbing over<br />
it. The visibility of the approaching vehicles by the pedestrians as well as the visibility of the<br />
pedestrians by the drivers of the approaching vehicles should be adequate. The railings should<br />
not, therefore, have any thick horizontal member, other than the baluster to achieve the desired<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
11
UTTIPEC<br />
objective. The guard-rails should be of sturdy but slender design. A tapered <strong>and</strong> thick base/<br />
ends to support the railing will prevent the pedestrians to climb over the railing to cross the road.<br />
Pedestrian guard-rails in reinforced cement concrete have also been found to be generally<br />
suitable in urban situations. Iron tubes, steel channeled sections <strong>and</strong> pipes may also be adopted<br />
so as to fit in with the environment or for better aesthetics. These can, however, be costly <strong>and</strong><br />
may also need higher level of maintenance. Long lengths of guard rails give any environment an<br />
undue effect of severe confinement <strong>and</strong> regimentation.<br />
When pedestrian <strong>and</strong> vehicle separation is desirable, thought should be given to possible<br />
alternatives rather than specifying guard rails as a matter of course. Continuous central refuges,<br />
small aqueducts, planters, bollards, trees, are all ways in which pedestrians can be screened<br />
from vehicles, <strong>and</strong> are infinitely preferable to the usual guard rails which seem to be springing up<br />
everywhere. If there is absolutely no alternative, guard rails should be erected at points of<br />
particular danger to pedestrians. The height of the pedestrian railing <strong>and</strong> divider should be such<br />
that it is a deterrent for pedestrian to climb over <strong>and</strong> jaywalking. The dividers/ central verge<br />
should be so designed to make it impossible for the pedestrians to walk over it.<br />
Occasionally, gaps in guard-rails may have to be provided to accommodate trees, pillar<br />
boxes, sign posts, electrical control boxes etc. located near the side-walk. However, these<br />
should be suitably designed to prevent pedestrians or little children from squeezing through to<br />
cross the carriageway. Preferably, the guard-rails should be set back from edge of the<br />
carriageway by at least 150 mm.<br />
Central dividers on wide roads ensure that vehicles confine their movements only to the<br />
correct carriageway, thus avoiding any conflict with traffic from the opposite direction. The rails<br />
over central dividers can be provided to ensure that pedestrians do not cross erratically or spill<br />
over the carriageway.<br />
Fig 6: Typical RCC pedestrian ‘Guardrail’<br />
Source: IRC: 103-1988<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
12
UTTIPEC<br />
It is recommended the length of the railing barrier should not be more than 200 M. The minimum<br />
length of railing barrier should be 50 M. RCC pedestrian guard-rails may be used in thickly<br />
populated area of Trans Yamuna <strong>and</strong> outer areas of Delhi, whereas mild steel/ steel railing/<br />
fencing of “Tubular Section” may be used as guard-rails for pedestrians in busy commercial <strong>and</strong><br />
institutional area (MCD area) to suit with the aesthetics <strong>and</strong> urban environment of the area.<br />
Fig 7: Typical RCC pedestrian ‘Guardrail’<br />
Source: IRC: 103-1988<br />
Fig 8: Steel Guardrails<br />
Source: GLC<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
Fig 9: Concrete Screening<br />
13
UTTIPEC<br />
Fig 10: Steel <strong>Barriers</strong>, Railing & Fencing<br />
Source: GLC<br />
Fig 11: Steel <strong>Barriers</strong>, Railing & Fencing<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
14
UTTIPEC<br />
Fig 12: Existing MS Railing at Lodhi Road<br />
Fig 13: Existing MS Railing at Aurobindo Marg<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
15
UTTIPEC<br />
5. Dividers<br />
5.1 Dividers<br />
Dividers are usually provided to earmark the segregated movement of a particular type/<br />
category of traffic, such as, segregating through carriage way from a service road for local traffic,<br />
segregating light <strong>and</strong> heavy traffic, segregating through traffic from turning traffic <strong>and</strong> dedicated<br />
BRT corridor <strong>and</strong> corridors for non-motorised transport (cycles, rickshaws etc.). The dividers can<br />
be within form of low height central verge, curb, railing, etc. which can be either permanent (steel,<br />
concrete etc) or flexible/ movable, shiftable such as rubberised cones, precast curbs <strong>and</strong><br />
electrically/ mechanically operated shiftable divider railings.<br />
5.2 Objectives<br />
Central dividers on wide roads ensure that vehicles confine their movements only to the<br />
correct carriageway, thus avoiding any conflict with traffic from the opposite direction. The rails<br />
over central dividers can be provided to ensure that pedestrians do not cross erratically or spill<br />
over the carriageway.<br />
5.3 Types of Dividers<br />
5.3.1 Central Verge/ Concrete Curb/ Parabolic Divider<br />
Usually wide central verge are provided as dividers within right of way. This encourages<br />
unrestricted <strong>and</strong> dangerous movement <strong>and</strong> crossing of pedestrians particularly in built up area/<br />
markets. This also restrict the effective carriage way.<br />
In certain areas where wide space is not available for central verge, narrow concrete curb are<br />
useful <strong>and</strong> may be provided. The concrete curb is usually in the shape of parabolic divider.<br />
Parabolic dividers <strong>and</strong> flower-beds which have a height of nearly 1 meter ensure pedestrian<br />
discipline. As the railings in the middle of roads are very vulnerable to accidents, parabolic<br />
dividers <strong>and</strong> flower-beds serve the same purpose more efficiently, besides improving the<br />
environment. A typical parabolic divider is shown in the Fig. 19. Traffic cones can be used for<br />
temporary segregation of traffic.<br />
Fig 14: Parabolic Divider<br />
Source: IRC<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
16
UTTIPEC<br />
Fig 15: Barrier cast-in-situ design<br />
5.3.2 Dividers with Railing over concrete curb<br />
With view to discourage the pedestrians from jaywalking <strong>and</strong> crossing the central verge,<br />
railings are provided over a narrow concrete curb. The height <strong>and</strong> width of the concrete curb is<br />
kept which does not allow pedestrians to walk <strong>and</strong> climb the railing. This also saves the valuable<br />
carriage way space.<br />
Fig 16: Kerb Stone with railing in between<br />
5.3.3 Temporary arrangements such as Plastic/ Fibre cones, etc.<br />
It is often witnessed as that in Delhi to cope up with segregated movement of traffic various<br />
temporary arrangements are put up such as plastic/ fibre cones, steel panels, plastic jerry canes,<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
17
UTTIPEC<br />
etc. as traffic dividers. These offer a temporary solution, which need to be considered together<br />
with pedestrian safety, infrastructure proper arrangement <strong>and</strong> aesthetics.<br />
Fig 17: Type design for<br />
reflective traffic cone<br />
Fig 18: High density traffic<br />
Barrier/ divider<br />
Source: IRC<br />
Traffic cones<br />
Rubber or flexible plastic<br />
Fig 19: Water filled Jerry can<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
18
UTTIPEC<br />
5.3.4 Shiftable/ Moveable Divider<br />
Keeping in view the tidal flow pattern of Delhi traffic, where there is a wide variations in<br />
directional traffic flow traffic flow during morning <strong>and</strong> evening peak periods, shiftable dividers can<br />
provide a greater efficiency <strong>and</strong> capacity enhancement of the carriage way in the required<br />
direction of heavier flow, within the existing right of ways. Such dividers can be manually placed<br />
in the form of modular steel units or electrically/ mechanically operated systems installed under<br />
the road, which facilitate sinking of the dividers within the road for dividing the lanes as per the<br />
traffic volume requirements (Fig: 21) .<br />
Fig 20: Typical design of a movable central divider<br />
5.4 Placement / Location of Dividers<br />
The location <strong>and</strong> placement of dividers is important to provide at wide pedestrian corridors in<br />
the areas/ roads with high pedestrian traffic, in order to secure pedestrians.<br />
Parabolic type is suitable for congested built up area, where there is limited narrow right of<br />
way. Plastic fibre cones <strong>and</strong> shiftable/ moveable dividers mat be used for management of traffic<br />
during peak period, special occasions <strong>and</strong> tidal flow management. While wider medians/ dividers<br />
are recommended for newly developed areas with sufficient right of way.<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
19
UTTIPEC<br />
6. Concluding Recommendations<br />
i. It is recommended on embankment, ramps to flyovers <strong>and</strong> interchanges <strong>and</strong> high speed<br />
corridors in open area. (not recommended for highly built up area with pedestrian <strong>and</strong> cycle<br />
traffic.)<br />
ii. End Treatment: It is important to provide suitable <strong>and</strong> treatment for such type of barrier in<br />
view of safety. The ends of this barrier must either be embedded into ground by tapering<br />
down or these must be embedded into the rigid parapet wall of a culvert or specially<br />
prepared rigid parapet fir the purpose of imbedding.<br />
iii. <strong>For</strong> rigid barrier, at the end compulsory left out <strong>and</strong> right out signage be placed as per IRC<br />
67:2001. The end of these rigid barriers may be treated with retro reflective tape or paint for<br />
night visibility <strong>and</strong> distant visibility.<br />
iv. Where considerable pedestrian traffic is expected, railing between the footpath <strong>and</strong><br />
carriageway <strong>and</strong> / or on the median of the road is provided separating the vehicular <strong>and</strong><br />
pedestrian traffic.<br />
v. It is recommended to put blinkers before the zebra crossing which should be made<br />
m<strong>and</strong>atory. At both signalised <strong>and</strong> unsignalised junctions the railing barrier should be<br />
provided for sufficient length to guide the pedestrians to the nearest planned pedestrian<br />
crossing. Pedestrian guard-rails in the vicinity of zebra should be of sufficient length to<br />
deter pedestrians from crossing the road at any arbitrary point along the road.<br />
vi. As the guard-rails would confine the movement of pedestrians to the footpath, it is<br />
obligatory that sufficient width of footpath be made available for the use of pedestrians.<br />
vii. It is recommended the length of the railing barrier should not be more than 200 M. The<br />
minimum length of railing barrier should be 50 M. RCC pedestrian guard-rails may be used<br />
in thickly populated area of Trans Yamuna <strong>and</strong> outer areas of Delhi, whereas mild steel/<br />
steel railing/ fencing of “Tubular Section” may be used as guard-rails for pedestrians in<br />
busy commercial <strong>and</strong> institutional area (MCD area) to suit with the aesthetics <strong>and</strong> urban<br />
environment of the area.<br />
viii. Parabolic type is suitable for congested built up area, where there is limited narrow right of<br />
way. Plastic fibre cones <strong>and</strong> shiftable/ moveable dividers mat be used for management of<br />
traffic during peak period, special occasions <strong>and</strong> tidal flow management. While wider<br />
medians/ dividers are recommended for newly developed areas with sufficient right of way.<br />
ix. It was suggested that the new road alignment project may include detailed design of<br />
median / crash barriers <strong>and</strong> railings.<br />
The “<strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrians Railings <strong>and</strong> Dividers”<br />
was approved in the 20 th UTTIPEC Governing Body meeting held on 15.01.2010<br />
under the chairmanship of Hon’ble Lt. Governor, Delhi.<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
20
UTTIPEC<br />
Members of Working Group I-B<br />
Chairman Sh. A.K. Bajaj –E.M. (DDA)<br />
Co-Chairman Sh. Ashok Kumar – Commr.(Plg.)DDA /<br />
Dr.S.P.Bansal, Addl.Commr.(Plg)<br />
Nodal Officer Sh. A.K. Jain – Advisor UTTIPEC (<strong>For</strong>mer)<br />
Convener Sh. Sabyasachi Das, Joint Dir. (Planning) UTTIPEC-III<br />
1. Sh. R P Indoria Secretary – Indian Road Congress<br />
2. Mr. S. Gangopadhay Head (T&T) – Central Road Research Institute<br />
3. Sh. Sanjiv Sahai MD (DIMTS)<br />
4. Sh. Vijay An<strong>and</strong> Director (Projects) – Delhi Metro Rail Corporation<br />
5. Sh. A.K. Sinha Nominee of Engineer-in-Chief-Public Works Department<br />
6. Sh. Ravi Dass Engineer-in-Chief – Municipal Corporation of Delhi<br />
7. Sh. Ramesh Raina Chief Engineer – New Delhi Municipal Council<br />
8. Engineer Member National Highway Authority of India<br />
9. Sh. A.K. Lahoti Chief Engineer - Northern Railways<br />
10. Nominated Member Ministry of Surface Transport<br />
11. Nominated Member Ministry of Shipping, Road Transport <strong>and</strong> Highways<br />
12. Sh. T.K. Malhotra President – AAUI<br />
13. Sh. Rohit Baluja President – Institute of Road Training Education<br />
14. Sh. Pavan Gupta Consultant – Institutional System Planning Centre<br />
Members of the Sub-Group<br />
1. Sh. A.K. Jain <strong>For</strong>mer Advisor UTTIPEC<br />
2. Sh. J.B. Kshirsagar Chief Planner – Town & Country Planning Organisation<br />
3. Representative of E-in-Chief Public Works Department/ SE/ EE<br />
4. Representative of E-in-Chief Municipal Corporation of Delhi/ EE(I) & EE (Civil)<br />
5. Secretary General IRC/ Addl. Dir.<br />
6. Representative of Chief Engineer New Delhi Municipal Corporation/ Ex. Engineer<br />
7. Sh. G R Shiromani Chief Engineer (<strong>Design</strong>) – DDA<br />
8. Sh. S.N. Srivastava, Jt. Commr. Of Police (Traffic)<br />
9. Sh. T.K. Malhotra President – AAUI<br />
10. Sh. Vinod Sakle Director, (Plg) UTTIPEC, DDA<br />
11. Sh. Rohit Baluja President – Institute of Road Training Education<br />
12. Sh. Ashok Bhattacharjee Jt. Director (Plg), UTTIPEC - I<br />
13. Sh. Pavan Gupta Consultant – Institutional System Planning Centre<br />
14. Sh. Amit Madholia Consultant – UTTIPEC, DDA<br />
Acknowledgements<br />
1. Sh. Subhash Ch<strong>and</strong> Sr. Scientist, CRRI<br />
2. Sh. P. K. Behera Jt. Director, UTTIPEC - II<br />
3. Sh. N. R. Aravind Dy. Director (Plg), UTTIPEC<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
21
UTTIPEC<br />
References<br />
Delhi Development Authority (2007), Master Plan for Delhi – 2021, New Delhi.<br />
MoUD (2006), National Urban Transport Policy-2006<br />
IRC 103-1988, <strong>Guidelines</strong> for Pedestrian Facilities<br />
IRC 6-2000, St<strong>and</strong>ard <strong>Specifications</strong> <strong>and</strong> Code of Practice for Road Bridges, Section – II<br />
IRC: SP: 73-2007, Manual of St<strong>and</strong>ard & <strong>Specifications</strong> for Two Laning of State Highways<br />
Cart Wright, RM (1980), The <strong>Design</strong> of Urban Space, The Architecture Press, London<br />
Chiara, J.D, Lee Koppleman, Urban Planning <strong>and</strong> <strong>Design</strong> Criteria, Van Nostr<strong>and</strong>, New York.<br />
Draft <strong>Guidelines</strong> <strong>and</strong> <strong>Specifications</strong> for <strong>Crash</strong> <strong>Barriers</strong>, Pedestrian Railings <strong>and</strong> Dividers<br />
22